The video, posted Thursday morning on the official Twitter account of the Republican National Committee, says: “The left’s dream boy … is America’s nightmare."

It attacks O’Rourke over several of the policies he supports, including his support of government-run health care. It also criticizes him for calling law enforcement “the new Jim Crow."

Democrat Beto O'Rourke, shown at his home in Sunset Heights in El Paso, officially entered the presidential race Thursday morning and immediately became the focus of Republican attacks.(Photo: Mark Lambie/El Paso Times)

The "Jim Crow" remark came during a campaign stop at Prairie View A&M University during his failed U.S. Senate run.

“That system of suspecting somebody, solely based on the color of their skin. Searching that person solely based on the color of their skin. Stopping that person, solely based on the color of their skin. Shooting that person, solely based on the color of their skin. Throwing the book at that person, letting them rot behind bars, solely based on the color of their skin. It is why, some have called this, and I think it is an apt description, the new Jim Crow,” he said.

DWI charges

It states that O'Rourke “lied about his hit and run DWI” and includes a Washington Post story stating that witnesses said he attempted to flee.

O'Rourke, who was 26 years old at the time, was arrested on a driving while intoxicated charge in 1998, but the charge was dismissed the following year after he completed a court-recommended DWI program.

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Democrat Beto O'Rourke, shown at his home in Sunset Heights in El Paso, officially entered the presidential race Thursday morning and immediately became the focus of Republican attacks. Mark Lambie/El Paso Times

O’Rourke has been a key figure in the debate over building a border wall, especially since Trump in his State of the Union address falsely stated that El Paso once was among the most dangerous cities in the country and became one of the safest because of the construction of the border fence.

O'Rourke has repeatedly said he's against the border wall. When it comes to border security, he has called for increasing customs enforcement staffing, increasing technology and increasing infrastructure investments.

Trump, GOP attack Democratic candidates

This is not the first time GOP officials have attacked Democratic presidential candidates after they announced their run for the highest office in the country.

Vermont U.S. Sen. Bernie Sanders, Massachusetts U.S. Sen. Elizabeth Warren, California U.S. Sen. Kamala Harris, former U.S. Department of Housing and Urban Development Secretary Julián Castro and Hawaii U.S. Rep. Tulsi Gabbard were all attacked by the Republican Party after announcing their candidacy.

"Crazy Bernie has just entered the race," Trump tweeted in February. "I wish him well!"

Trump mocked Warren after her controversial announcement that a DNA test showed she had distant Native American ancestry. The test results were inconclusive, the Associated Press reported.

Warren has since apologized several times.

“If Elizabeth Warren, often referred to by me as Pocahontas, did this commercial from Bighorn or Wounded Knee instead of her kitchen, with her husband dressed in full Indian garb, it would have been a smash!” Trump said on Twitter after Warren’s announcement.

Ahrens called Castro a lightweight with no chance of winning.

“Julián Castro has made history by becoming one of the biggest lightweights to ever run for president,” Ahrens said in a Twitter post. “He was a weak mayor who couldn’t even handle being HUD secretary. This is obviously just another desperate attempt to become someone else’s running mate.”

As for Gabbard, Ahrens called out her lack of experience and supporters. He also mentioned her support for Syria President Bashar al-Assad.

“Tulsi Gabbard has an even bigger problem than her lack of experience — it’s that she has no base of support,” Ahrens said. “Liberals think she’s too conservative, conservatives think she’s too liberal, and just about everyone thinks her coziness with Bashar al-Assad is disturbing."